Optimum design of agitator geometry for a dry stirred media mill by the discrete element method

Chiharu Tokoro, Yuki Ishii, Yuki Tsunazawa, Xin Jiang, Kyoko Okuyama, Motonori Iwamoto, Yasuyoshi Sekine

Research output: Contribution to journalArticlepeer-review

Abstract

Three different agitator geometries for a dry stirred media mill with a horizontal drum were studied experimentally and by DEM (discrete element method) simulation. Two optimized models, model A with stirring arms oriented in the same direction and model B with inclined stirring arms, achieved more rapid grinding with the lower adhesion of particles to the mill than the conventional stirring arms. Model A achieved the finest grinding with sharpest particle distribution. DEM simulation results suggested that rapid mixing, large collision energy, and a large number of collisions result in rapid grinding. DEM simulations of model A confirmed that the particle collision energy in this model was the highest of the models tested and resulted in the largest energy consumption and the largest temperature increase. In model B, DEM simulation results suggested that collision energy increased locally at the wall and resulted in a local temperature increase at the shaft. The high number of collisions in model B also resulted in rapid grinding but with a broad particle distribution. The decrease of the particle adhesion in models A and B was caused by a decrease in the collision energy between particles and the wall in the normal direction.

Original languageEnglish
Pages (from-to)850-859
Number of pages10
JournalAdvanced Powder Technology
Volume32
Issue number3
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • Agitation
  • Grinding energy
  • Grinding kinetics
  • Grinding limit
  • Mixing index

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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